Safety valve



Patented Nov. 20, 1928.

" UNITED si'iAfTEfs .FRENCH n. 'Gomma or BLUiirrEL-n, WEST VIR-orma;

SAFETY VALVE. 'Y

Application filed September 28, 1927." Serial'No. 222,667. y

Thisk invention relates to 4safety valves of the kind that are usually mounted in boiler connections and the'like to prevent the escape' of steam or hot water in case the connections are broken.

The locomotive boiler is provided with a variety ci connections leading to gages, blow-oils, etc.,` and incase breakingv of these connections occurs, through wrecking of the locomotive or otherwise, the escaping steam or hotA water from theboiler will be liable to scaldthe trainmen unless means are provided to prevent Vsuch escape of the steam and hot water. V

The primary object of the presentr inven-V tion is to provide a safety valve for such connections that willbeautomatically closed by the fluid pressure of the boilerin case such connectionsare thus accidentally broken off.'

and which may be assembled or dissembled with a minimum amount of work. y

The inventive idea iscapable of receiving a variety of expressions, one of which, for the purpose of illustrating the invention, is shown inl the accompanying drawings, but it is to be expiesslylunderstood that` such drawings are for the purpose of illustration only and are not designed to deline the limits ot the invention, reference being had' to the appended claims for lthis purpose.

e In said drawings-- Fig. 1 is a perspective view ofa valve ern-,

bodying the invention;

Fig. 2 is a longitudinaly section thereof, the parts being shown in elevation; v

Fig. 3 is aperspective view of thevalvecarrying bushing; and

Fig. 4 stem.

numerals designate like parts throughout is a brokenA detail of the valve" In said drawings, in which like reference the several views," 1 is a casing provided o n its interior -end ,with screw-threads 2', whereby it vmay be screw-threaded into a boiler and on the exterior end with lefthand screw-` threads 3, to the end that the valvebonnet 4 may be screwed thereto. This casing 1 hasl va centralfport or openingv leading into the boiler, which port is surroundedby an annularrshoulder 6'. Within the casing 1, a bushing' 7 is screw-threaded as at 8, such screw-t ireads being formed at the inner end of the bushing and if desired throughout the length 'of thev bushing, as shown.

vThe inner end of the bushing is provided with a' valve lchamber 9 which, near its inner end, has a valve seatvlO, and a valve 11 having a stem portion 12 is mounted in the valveA chamber 9 so that the valve 11 can play between the shoulder 6 and the valve seaty l0.

The size of the valve 11 issuch that, when it is slightly raised off or itsV seat and out of around the valve and gain access to a groove 13,v Fig. 3, exterior to the valve 11 and formed about the ystem '121A plurality of'ispiral g grooves 14 extend from the groove 13 around the stem 12 to the outer end thereof. TheH serted the valve chamber 9 ot the bushing,

which chamber' has an inwardly 'projecting lug I9, Fig. 8, `while the valve is 'provided with a corresponding groove 20. When the valve Vis'. inserted'within the bushing, thev groove 2O` is brought oppositethe lug 19 tothe end that the valve may readily pass into they bushing and then given a slight turn, whereupon the lug 19 preventsthe valve from dropping out, the valve and its stem 'nevertheless being left free to vrotate' within the valve chamber in theA` bushing.; Byv reasonv of the spiral grooves 14. on the stem ofthevalve and the, grooves 15 andI 16 on the face ofthe valve, steam passing outwardly from the boiler serves to rotate theyalve, thus keeping the valve and valve receiving chamber tree from, any accumulation of scale or dirt. The bush.

PaiEnripolierten/ff len v contacta/'ith theshouldei 6,'steamV may passL ing 7 at its exterior end 7 lits snugly withinV an interior chamber of the bonnet 4. The valve-operating stem 22 is screw-threaded at 22 into the eXterior end of the bonnet'4' and is provided with the usual or any suitat its interior end, an extension 24 of .smallerv diameter than the main valve-operating stem 22 and of considerably less diameter than the interior oi the bushing 7 'at that point, to the end that the stem that passes around the valve ll `from the boiler may pass around the valve extension 24. Preferably this ei:-v tension 24 is screw-threaded to the interior end of the valve-operating stem, of which it forms a part, and for the purpose oi' enabling the same to be screwed into or unscrewediirom said stein, he same is provided with ilattened faces`24, as clearly shown in Fig. 4. At the point where the valve-operating stem unites with extension24, said stem is provided with a valve 25, here shown as preferably formed by the suitably shaped end of said valve-operating stem and seats on a valve seat 26, and when seated prevents the outward passage of steam.

The valve-operating stem 22 is slightly reduced at 2T, so that there is an annular space surrounding the stem opposite an opening 28 leading into the interior of the bushing. A pipe 29 is secured into or otherwise connected to the casing l, and when the parts are assembled, the port or opening 28 is opposite the open end of the pipe 29, which pipe leads to the gage cock or other Connection.

Preferably the opening 28 is larger than that of the end opening of the pipe 29p, in order to insure perfect registration without the necessity ot exercising undue care in that regard when the parts are assembled.

rlhe casing l is formed tor the reception of a wrench to screw the Vsame into a boiler, and the bonnet4 is likewise formed for the reception of a wrench for the purpose of screwing the same onto the casing.

For the purpose of enabling the bushing 7 to be screw-threaded into the casing l, openings 7 are provided in the outer end ot' the bushing, through which a rod may be passed for this purpose. groove 30, Figs. l and 2, is formed around the casing opposite the point where the part 24 of the valve-operating stem bears upon the valve stem 12, and immediately opposite this groove 30 in the' casingis formed an annular groove 3l around the bushing. These two grooves serve to weaken the casing and theV bushing at this point, and in casev the structure becomes broken at any place the break will occur at this weakened point, in which case the steam from the boiler passing outward through the porty 5 forces the valve ll onto the valve seat l0,

An external annular thus effectively preventing the escape of steam or water from the boiler. h

Vln assembling the parts, the casing is Yscrew-threaded into the boiler in the absence ing, the threads uniting the two parts being such that when the bushing is screwed home so that the inner end oi the bushing contacts with the shoulder 6, the port 28 comesoppo4 siteithe opening oi? the pipe 29.

The bonnet 4 is Vthen screwed onto the exterior end of the bushing, the valve op era'ting'stem 22 tlrst having` preferably been screw-threaded in to the outer end of the bonnet. The packing 34 surrounds the valve-operating stem 22 and'is compressed between oppositely disposed annular concave shoulders in the bonnet 4 and onthe end of the bushing, 1 i j VJ ith the parts thus assembled, the valveoperating stem 22 is screwed down through the operation of the handle 23 with the stern extension 24 resting in the concave socket 17 of the valve stem, until the valve 11 is slightly raised from its seat l0. Y y

llith the parts in this position steam passes through the port 5 around the valve 1l 'through the groove 14' and around the valve stem extension 24, and, the valve 25 being slightly raised from its seaty26, passes through the port 28and into the pipe By screwing the valve stem 22 in to a sutlicient extent, the valve 25 may seat lirmly on 'the seat 26, thus entirely preventing the es- AD cape or" steam through the ports 28 and the pipe 29. This valve seat 26 is one that requires frequent grinding to cause it to V'tunetion perfectly, and by unscrewing the bonnet 4 romthe casing 1,'said bonnet with the valve-operating stem"and the valve 26, as well as the valve stem extension 24, are readily removed and the valve seat 26 exposed for grinding without removal o'l' the parts from their connection with the boiler. lnas` much as the pressure on the valve stem l2 has'been withdrawn by reason ot the withdrawal of thevalve-operating stem 22, steam passing outwardly through the port 5 forces the valve 11" lirmly on its seat l0, and thus the escape oi steam is prevented and the grinding operation can be effected even though steam is carried in the boiler. Moreover, under the requirements of the Interstate Commerce Commission, the interior passages of these valves have to be inspected and cleaned at short intervals, and by thus removing the bonnet and the valve-operating stem, as just described, the interior passage of the bushing down tothe valve stem i2 is open Vfor cleaning by the passage of a 'rod therethrough.` In case there is no steam in with a suitable brush or rod without discon-v nectingthevalve casing from the boiler, Preferably the valve unit is made of VMonel metal, though this is not absolutely essential.

It will beobserved that the valve constituting this invention is one ot extremely simple construction, readily assembled and disassembled with few operations, and requiring no tools other than a wrench, and a rod to pass through the openings Z in the bushing.

lVhile the valve shown in the drawings'has been specifically described in detail, it is to be understood that the invention is not limited to such specific details and that the same may be varied within the limits ot the appended claimsv without departing from the invention. l

lVhat is claimed is: y

vl. In a valve of the Acharacter described, the combination of the casing open at inner end, a tubular bushing sicured in the casing, a valve and valveseat .located in the inner end of the bushing, a bonnet secured to the outer end ot the casing, a valveoper ating stem screw-threaded into the bonnet and passing into the bushing and into operative relation with the valve in the inner end of the bushing, and a valve on said valve stem and seating on a valve-seat within said bushing.

2. In a valve ot the character described, the combination of the casing open inner end, al tubular bushing having two valve-seats :formed therein, separate valves cooperating one with each seat, a bonnet screw-threaded 0n said casing, and a valvestem screw-threaded in said bonnet for openling the inner valve and closing the outer valve when the inner valve is fully open, thek inner valve adapted to be moved toward its seat by fluid pressure on retraction of the valve stem and outer valve.

3. In a valve of the character described, the combination of a casing having a port for communicatingwith a boiler, a bonnet valve.

`into a boiler, and having secured to-theouter end of the casing, a tubular bushing within the easing, a valve and valve-stem mounted in the inner end of said bushing, a valve-operating stem extending through.v said bonnet into thebushing and into operative relation with said valve-stem, said bushing and casing being weakened atv Va point approximately opposite the outer end ot said valve-stein.

In a valve et the character described, the combination of a casing adapted to open int-o aboiler, and a `steam connection lead# ing from saidcasing, a tubular bushing in said casing having aV port leading to said steam connection, a valve within the inner end or said biiishing capable of being closed by Vpressure trom the boiler, a lvalve-operating stem to open said valve against boiler pressure, and a valve on said va-lvefoperating stem between the boiler and said steam con# nection. 'i

5. In a valve of the character described, the combination or" a casing and aibushing, a valve in said bushing closingl under boiler pressure, said casing'and bushing being pror vided withfracture lines exterior to said Ina valve of the character described, the combination of a casing adapted to openI a steam conveying yenduit leading therefrom, a bushing secured tits ner end in said casing and removable 'through the outer endV thereof, safety valve mounted in the inner ol said bushing, a bonnet secured to the casino' and, withy i the casing, enclosing said bushing, and a y valve-operating stem adjustably mounted. in

said bonnet7 whereby said valve, bushing,

bonnet and stem may beremoved without disturbing said casing or conduit. i 7. In a valve of the character described, the combination oit' casing open at its inner end, a bushing in said casing having a valve-receiving chamber with an inwardly projecting lug, and a revoluble valve in .said chamber, saidvvalve being provided with a peripheral recess capable of being brought into registry with said lug.

In testimony whereof I have siened this specication.

i rennen n eonsnr. 

